Study on the fine・cale mixing ・ chemical reaction process of matter in the liquid turbulent flows and the stochastic simulation method

液体湍流中物质的细小混合·化学反应过程及随机模拟方法研究

• 批准号: 16360089
• 负责人: SAKAI Yasuhiko
• 金额: $ 9.79万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16360089/
• 关键词: turbulent mixing; concentrations of multiple species; chemical reaction process; fine scale diffusion field; light absorption spectrometric method; probability density function method; random Fourier modes method; molecular mixing model; 分子拡散モデル

The progress and results of the research are summarized in the following.Obiect(A) Development of high resolution measuring system of concentration fluctuations for multiple species, and the measurements of mixing ・ reactive field of multiple 'species by this systemWe developed the simultaneous measuring system of concentration fluctuations for 3 species by the optical fiber with the diameter of 10 u m, which is useful for the liquid-phase turbulent mixing field. In order to improve the accuracy of measurement, the new data processing technique to obtain the actual concentration signal by using the reference signal (in case of concentration 0) and measuring signal was suggested. The experimental apparatus for the two-dimensional turbulent reactive jet was also manufactured, and the concentration field without the reaction was measured by the new concentration measuring system. It is found that the fundamental statistics, e.g., the mean concentration and the r.m.s. value, etc. show the … More same profiles as those obtained by the former measuring system. So, it was concluded that the new system is useful for the concentration measurement in the turbulent diffusion field. Further, the measurements for the second-order chemical reaction field in the two-dimensional jet have been performed by using the former measuring system, and the understanding for the relationship between the chemical reaction and turbulence was promoted.Object(B) Numerical simulations of the diffusive ・ reactive fields by the stochastic differential equation and random-Fourier modes method.The simulation of the second-order chemical reaction field in the axisymmetric turbulent jet has been made by the Lagrangian probability density function method (PDF method). Practically, the experimental data for the moments up to the second order of the velocity PDF are specified, and the PDF method was applied to only the concentration field (we call this technique the semi-empirical PDF method). In this simulation, the IEM model was used as the molecular mixing model. Consequently, it is confirmed that the concentration fluctuation fields for all the species relating to the chemical reaction were predicted successfully by this semi-empirical PDF method. On the other hand, the turbulent field around the two-dimensional aerofoil was simulated by the combined model of the random Fourier modes and the rapid distortion theory. It is found that the fluctuation velocity statistics, in particular the velocity spectra can be predicted well by this combined model. At present, the hybrid model of the random Fourier modes method and the molecular mixing model is being developed. Less

目的研制高分辨率多组分浓度波动测量系统，并利用该系统对多组分混合反应场进行测量我们研制了直径为10µm的光纤同时测量3种组分浓度波动的系统，该系统可用于液体湍流混合场的测量。为了提高测量精度，提出了利用参考信号(当浓度为0时)和测量信号获取实际浓度信号的新的数据处理技术。研制了二维湍流反应射流实验装置，并利用该系统对无反应的浓度场进行了测量。结果表明，基本统计量，如平均浓度和相对分子质量分数，均有不同程度的变化。值等显示…与以前的测量系统得到的轮廓更一致。因此，该系统可用于湍流扩散场中的浓度测量。利用该测量系统对二维射流中的二阶化学反应场进行了测量，加深了对化学反应与湍流之间关系的认识。目标(B)用随机微分方程和随机傅立叶模法对扩散·反应场进行了数值模拟。实际上，速度PDF的二阶矩的实验数据是特定的，而PDF方法只应用于浓度场(我们称这种方法为半经验PDF方法)。在本模拟中，分子混合模型采用IEM模型。结果表明，该半经验概率密度泛函方法成功地预测了与化学反应有关的所有物种的浓度脉动场。另一方面，采用随机傅立叶模式与快速变形理论相结合的方法，模拟了二维翼型的湍流流场。结果表明，该组合模型能很好地预测脉动速度统计，特别是速度谱。目前，随机傅里叶模法和分子混合模型的混合模型正在发展中。较少

项目成果

高シュミット数物質噴流拡散場における物質フラックスの統計的特性

高施密特数材料射流扩散场中材料通量的统计特性

• 发表时间: 2007
• 期刊: 日本機械学会論文集(B編) 73巻・727号
• 作者: 酒井康彦;内田健児;久保 貴;長田孝二
• 通讯作者: 長田孝二

Statistical Characteristics of the Cross-Sectional Concentration Flied in a Round Counter Jet

圆形反射流飞行截面浓度的统计特性

• 发表时间: 2006
• 期刊: Journal of Fluid Science and Technology Vol. 1.,No.2
• 作者: 米田 広;渡辺 貴洋;伊澤 精一郎;熊 鰲魁;福西 祐;Yasuhiko SAKAI et al.;Y. Nakashima;Kouji NAGATA et al.;Y. Nakashima;Hiroyuki TSUNODA et al.
• 通讯作者: Hiroyuki TSUNODA et al.

Experimental Study on the Mixing and Chemical Reaction in the Liquid Grid-Turbulence

液体网格湍流中混合与化学反应的实验研究

• 发表时间: 2004
• 期刊: Fluid ＆ Heat Engineering Research Vol. 39, No.1
• 作者: 酒井康彦;田川眞司;井上諭;久保貴;長田孝二;酒井康彦;Takashi KUBO;久保 貴;Yasuhiko SAKAI et al.;Takashi KUBO et al.;Takashi KUBO et al.
• 通讯作者: Takashi KUBO et al.

Velocity and Passive Scalar Cross Spectra in Stably and Unstably Stratified Grid Turbulence

稳定和不稳定分层网格湍流中的速度和被动标量互谱

• 发表时间: 2007
• 期刊: Journal of Fluid Science and Technology Vol.2・No.1
• 作者: Lee;Won-Je;Kawahashi;M.;Hirahara;H.;Kouji NAGATA
• 通讯作者: Kouji NAGATA

Derivative Statistics of Axial Velocity and Passive Scalar in the Jet Diffusion Field of High-Schmidt-Number Matter

高施密特数物质射流扩散场中轴向速度和被动标量的导数统计

• 发表时间: 2007
• 期刊: Proceedings of FEDSM2007, 5th Joint ASME/JSME Fluids Engineering Conference (in press)
• 作者: Lee;w-J;Kawahashi;M.;Hirahara;H.;S.Izawa;Yasuhiko SAKAI et al.
• 通讯作者: Yasuhiko SAKAI et al.